Control valve



June 10, 1947. MULLER 2,422,119

CONTROL VALVE Filed Aug. 25, 1943 INVENTOR J'omm ILMULLER, I

rmx'mm ATTORNEY;

Patented June 10, 1947 CONTROL VALVE Johan A. Muller, Dayton, Ohio,assignor to H-P-M Development Corporation, a corporation of DelawareApplication August 26, 1943, Serial No. 500,069

3 Claims.

This invention relates to a valve, having special application tohydraulic machinery including one or more hydraulic motors, although itis not limited to such structure.

An object of the invention is to provide a compact control valve unitwhich may be installed as a unit in the bored hole or orifice of a panelblock when used as a part of a control system for one or more hydraulicmotors.

It is another object of this invention to provide a valve with asealed-in pressure level.

Another object of this invention is the provision of a valve of the typedescribed having means for indicating the setting of the valve.

Still another object is to provide a valve including a tapered plug in atapered hole with means to obtain a very accurate control in the spacebetween the tapered valve plug and the tapered hole in the valve body sothat a predetermined volume fiow of fluid through the valve can alwaysbe obtained with a predetermined setting of the valve.

A further object of the invention is to obtain the foregoing objects byproviding accurately ground guide members that are freely reciprocable,whereby it will always be possible to preset the valve plug and thus toobtain a predetermined flow of hydraulic fluid therethrough.

An additional object of the invention is to provide a valve forcontrolling accurately the flow of hydraulic fluid through a valve, thevalve having an indicating device on the exterior thereof which willaccurately indicate the volume flow through the valve.

Another object is to provide a valve of the type stated in the precedingparagraph wherein the indicating means is provided with indicia whichindicates the speed of operation of a hydraulic motor.

Other objects are indicated throughout the specification.

In the drawings:

Figure l is an end elevational view of the valve showing the adjustingknob and indicating mechanism;

Figure 2 is a vertical longitudinal sectional view through the valve andcasing, and showing in perspective a hydraulic system connected thereto;

Figure 3 is a section of the interior of the valve taken on the line 3-3of Figure 2, and

Figure 4 is another section of the valve taken on the line 4-4 of Figure2.

In general, this invention is directed to a valve which may beinstalledas a unit in a bored hole of a panel block. The valve hasparticular application when used with and as a part of a control systemfor one or more hydraulic motors using a single pressure source.

Referring now to the drawings in detail, the valve shown thereincomprises a valve body indicated by the numeral l, and a tapered plugindicated at 2. The Valve body is provided with a tapered seat 3 whichcooperates with the tapered plug 2 to give the desired throttlingaction.

The tapered plug has guide members or extensions 4 and 5 which arecylindrical and which fit within a cylindrical bore 6 of the valve, anda cylindrical bore 1 of a sleeve member 8. The sleeve 8 may be heldrigidly in position by means of a shoulder 9 which fits Within a recessIU of the valve body by means of screws II. The extensions 4 and 5 serveto guide the plug 2 accurately to its seat 3, whereby it is guided alongthe center line of the valve body.

Motion is imparted to the tapered plug by 4 means of the threadedspindle l2 which engages internal threads I3 in the extension 5. spindleI2 is turned by means of a knob or graduated hand wheel l4. Said handwheel is retained on the valve body by means of a collar l5 secured tothe wheel which fits within a recess [6 of a retaining plate I1. Meanssuch as screws. l8 serve to retain the hand wheel and other parts inposition on the valve body. Other securing means such as screws I9 serveto retain the aforementioned parts as a unit in position within anaperture 20 of the panel 2l.

Slippageat the left hand end of the valve is prevented from leaking tothe exterior by means of a ring 22, preferably made of carbon, and saidring is provided with a circular collar 23 which fits within a circularrecess 24 in the left hand end of the sleeve member, the ring beingforced to the right so as to make a tight contact by a plurality ofsprings 25..

The extension 4 is provided with a hollow squared interior 2B which isadapted to receive a squared shaft 21 which is fixed to the collar 28,which latter may be of square configuration and fit within a squaredrecess 29 within the right hand end of the valve body as viewed inFigure 2. The squared shaft 21 by reason of the fact that it fits withinthe squared interior 26, prevents rotation of the tapered plug 2, whenadjustment of the valve setting is made by means of the hand wheel l4.

The tapered plug 2 is'provided with a bore 30, and this bore connectsthe squared interior 26 in the extension 4 with the recess defined bythe The p which graduations become visible through a hole.

35 in the cover 35, as the dial 33 is indexed. Preferably, thegraduations on the hand wheel H! are from zero to 9.9. For eachrevolution of the hand wheel M the dial 33 is indexed one-tenthrevolution. Consequently, the setting of the valve may be indicated tothree figures. V

As will be seen from an inspection of Figure 1, the cover 36 is held inposition on the retaining plate I! by means of ears 3'! integral withsaid cover, having apertures (not shown) by means of which it is held inposition by screws :38. v

The valve casing l is provided with a screwthreaded aperture 39 whichleads into the chamber 40, and a screw-threaded aperture 4| which A pipe43, as shown.

leads to the chamber 42. in Figure 2, is in screw engagement with theaperture 39 and-a pipe 44 is in screw-threaded engagement with theaperture 4|. The pipe 43 may be considered as a drainage pipe and assuch it connects to the tank or reservoir R, and pipe 44 connects to avariable delivery pump P, and to a hydraulic motor M, by the connectionsindicated in Figure 2. I

Squared shaft 21 is further provided withla plurality of passageways 45as shown in Figure 4, and the threaded spindle I2 is provided withpassageways '16 as seen in Figures 2 and 3. The purpose of thepassageways or grooves 45 and 46 is to maintain the chambers 41, and 48at the opposite ends of the guide members or extensions 4 and 5, incommunication with the exhaust side of the hydraulic system of which thevalve forms a part by way of passages 60, Figure 2, in order that therewill be no pressure built up in these chambers because f slippage ofhigh pressure fluid past the extensions 4 and 5. These drainagepassageways 4.5 and 46 are essential because it is thereby madeimpossible for liquid pressure to build up in either of the chambers orspaces. 4! and 48. Thus no fluid finds'its way past this seal and to theexterior portions of the hand Wheel l4 and the dial .33. Thus pressurein the chamber 41 is substantially the. same as in exhaust chamber 43.The same is true of pressure within the chamber 48 and there exists notendency for liquid in this chamber to find its 'way to the outside ofthe valve by way of the contacting surfaces of the squared recess 29 andcollar 28, or between the contacting surfaces of the squared shaft 21and the collar 28. Any liquid within either of these chambers finds itsway through passages 4'5 and 46 to the chamber 40 which leads directlyto the exhaust pipe 43, the whole being connected to the reservoir. Thecarbon seal ring 22 provides an effective seal against the low pressurewithin the chamber 47. It will also be appreciated that the hand wheelis must be so mounted as to be freely rotatable when actuated, and forthis reason it would not be possible to provide tight packing fittingsto prevent leakage of fluid to the hand wheel. The provision of thepassageways 45 and 45 .for draining fluidinto the exhaust pipe '33therefore makes it possible to do away with such tight packing fittings.v

The extensions d and 5 are each provided with a plurality of circulargrooves 52 and 5|, respectively. These grooves accomplish twopurposes, 1. e., they provide a radial hydraulic balancing on theextensions or guide members, whereby said guide members tend to float ona film of fluid such 5 as oil, and it will be noted that the guidemembers or extensions are co-axial with each other in the cylindricalbores 6 and I. These grooves further provide a graduallydecreasingpressure toward the outside ends of the guide members,

10 i. e., toward the chambers 48 and 41, whereby t0 reduce slippage ofpressure fluid past the guide \members.

It-will be understood from the foregoing description that the presentinvention includes a valve is constructed whereby very accurate controlmay be maintained in the space between the tapered valve plug and thetapered hole in the valve body, whereby a predetermined volume flowoffluid through the valve can always be obtained through a predeterminedhand setting of the valve.

This result is obtained in large part because the 5 ble. It is thusalways possible to pre-setthe valve plug and to thereby obtain apredetermined flow of hydraulic fluid therethrough.

It becomes very important to obtain accurate control, i. e., apredetermined volume flow of fluid through the valve upon apredetermined setting of the same, in hydraulic control systems wherein.

a motor is hydraulically driven, such as shown in Figure 2. It will beapparent that in order to obtain accurate control of the speed ofthishydraulic motor that it is necessary to accurately control thevolume through the motor and it will be apparent that the constructiondescribed above accomplishes this purpose.

It will be understood that the invention is not limited to theparticular construction shown in the drawings, but also embraces suchmodifications as come within the scope of the appended claims. 7

What is claimed is:

r 1. The combination in a valve, of a valve body,

a flow passage through said valve body comprising a relatively longtapered valve seat, a relatively long tapered valve member adapted'withsaid seat to form a variable orifice, projections integral with saidvalve member extending axially either.

way therefrom for engagement with said Valve body whereby said valvemember is rigidly guided toward and from said seat, one of'saidextensions.

having a threaded recess, therein, ahand wheel ,having a threadedportion adapted for engagement with said threadedrecess, a plate adapted.for rotatably securing said hand wheel tojsaid body, and sealing meanscomprising a spring.

pressed annular ring carried by one of said hand 0 wheelsand body and inengagement with the other thereof for preventing leakage of fluid fromsaid body.

2. The combination in a valve, of a. valve body, a flow passage throughsaid valve body comprising 5 a relatively long tapered valve seat,cylindrical bores in opposite ends of said valve body having their axesparallel with the axis of said tapered seat, a valve member comprisingcylindrical end.

portions receivedin said bores and a relatively, long tapered central.portion adapted for form.-

ing with said seat an adjustable orifice, one'of said extensions havinga key way therein, a key aflixed to said body and in engagement withsaid key-way for preventing rotation of said valve 19 member, the otherof saidextensions having a threaded bore therein, a hand wheelexternally of said body having a threaded extension thereon inengagement with said threaded recess, said hand wheel comprising anannular flange, and a plate secured to said body having an annularrecess therein adapted rotatably, to secure said hand wheel to saidbody.

3. The combination in a valve, of a valve body having a low pressurechamber and a high pressure chamber interconnected by a tapering valveseat, cylindrical recesses in each end of said valve body in axialalignment with the axis of said seat, a tapering valve member in saidvalve body having cylindrical extensions extending into said cylindricalrecesses, the extension on the high pressure end of said valve beingshaped for receiving a key, a key rigidly secured to said valve body andextending into said extension whereby rotation of said valve member isprevented, the extension on the low pressure end of said valve bodybeing internally threaded, a hand wheel rotatably secured to the lowpressure end of said valve body and having a threaded projection thereonengaging the said threaded extension, sealing means comprising a springpressed annular ring between said hand wheel and body urged against onethereof, and means continuously exhausting said cylindrical recessescomprising passage means extending from said recesses through said valvemember and into said low pressure chamber.

. JOI-IAN A. MULLER.

REFERENCES CITED The following references are of record in the me ofthis patent:

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